Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly
Sign up
Appearance settings

Commit fc175bc

Browse files
add 24 and 25
1 parent c778dce commit fc175bc

File tree

2 files changed

+137
-11
lines changed

2 files changed

+137
-11
lines changed

‎ch_15/Exercise15_24.java

Lines changed: 16 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -3,12 +3,16 @@
33
import javafx.animation.PathTransition;
44
import javafx.animation.Timeline;
55
import javafx.application.Application;
6+
import javafx.collections.ObservableList;
67
import javafx.scene.Scene;
7-
import javafx.scene.Group;
8-
import javafx.scene.layout.BorderPane;
8+
import javafx.scene.layout.Pane;
99
import javafx.scene.paint.Color;
1010
import javafx.scene.shape.Arc;
1111
import javafx.scene.shape.Circle;
12+
import javafx.scene.shape.Line;
13+
import javafx.scene.shape.Polyline;
14+
import javafx.scene.text.Font;
15+
import javafx.scene.text.Text;
1216
import javafx.stage.Stage;
1317
import javafx.util.Duration;
1418

@@ -21,17 +25,16 @@
2125
public class Exercise15_24 extends Application {
2226
@Override
2327
public void start(Stage primaryStage) {
24-
Group group = new Group();
28+
Pane pane = new Pane();
29+
2530
Circle circle = new Circle(0, 0, 10);
2631
circle.setFill(Color.ORANGE);
2732

2833
Arc arc = new Arc(125, 100, 80, 40, 210, 125);
2934
arc.setFill(Color.WHITE);
3035
arc.setStroke(Color.BLACK);
31-
32-
group.getChildren().add(arc);
33-
group.getChildren().add(circle);
34-
36+
pane.getChildren().add(arc);
37+
pane.getChildren().add(circle);
3538
PathTransition pt = new PathTransition();
3639
pt.setDuration(Duration.millis(4000));
3740
pt.setPath(arc);
@@ -40,13 +43,15 @@ public void start(Stage primaryStage) {
4043
PathTransition.OrientationType.ORTHOGONAL_TO_TANGENT);
4144
pt.setCycleCount(Timeline.INDEFINITE);
4245
pt.setAutoReverse(true);
43-
pt.play();// Play animation
46+
pt.play();
4447

45-
group.setOnMousePressed(e -> pt.pause());
46-
group.setOnMouseReleased(e -> pt.play());
47-
Scene scene = new Scene(new BorderPane(group), 250, 200);
48+
pane.setOnMousePressed(e -> pt.pause());
49+
pane.setOnMouseReleased(e -> pt.play());
50+
51+
Scene scene = new Scene(pane, 250, 200);
4852
primaryStage.setTitle(getClass().getName());
4953
primaryStage.setScene(scene);
5054
primaryStage.show();
5155
}
5256
}
57+

‎ch_15/Exercise15_25.java

Lines changed: 121 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,18 @@
11
package ch_15;
22

3+
import javafx.animation.PathTransition;
34
import javafx.application.Application;
5+
import javafx.collections.ObservableList;
6+
import javafx.scene.Scene;
7+
import javafx.scene.input.MouseButton;
8+
import javafx.scene.layout.Pane;
9+
import javafx.scene.shape.Circle;
10+
import javafx.scene.shape.Line;
11+
import javafx.scene.shape.Polyline;
12+
import javafx.scene.text.Font;
13+
import javafx.scene.text.Text;
414
import javafx.stage.Stage;
15+
import javafx.util.Duration;
516

617
/**
718
* **15.25 (Animation: ball on curve) Write a program that animates a ball moving along
@@ -10,8 +21,118 @@
1021
* a click on the left/right mouse button.
1122
*/
1223
public class Exercise15_25 extends Application {
24+
private final double sceneWidth = 600;
25+
private final double sceneHeight = 260;
26+
private final int fontSize = 16;
27+
28+
private final double centerX;
29+
private final double centerY;
30+
31+
public Exercise15_25() {
32+
centerX = sceneWidth / 2;
33+
centerY = sceneHeight / 2;
34+
}
35+
1336
@Override
1437
public void start(Stage primaryStage) throws Exception {
38+
Pane pane = new Pane();
39+
Polyline xAxis = new Polyline();
40+
Polyline yAxis = new Polyline();
41+
drawYAxis(pane, yAxis);
42+
drawXAxis(pane, xAxis);
43+
44+
Polyline polyline1 = new Polyline();
45+
ObservableList<Double> list = polyline1.getPoints();
46+
int startXValue = -170;
47+
int endXValue = 170;
48+
for (int x = startXValue; x <= endXValue; x++) {
49+
list.add(x + centerX);
50+
double y = calculateY(x, centerY);
51+
list.add(y);
52+
if (isYIntersectingXAxis(y, centerY)) {
53+
Text text = new Text(x + centerX, centerY / 0.9, getXAxisLabel(x));
54+
pane.getChildren().add(text);
55+
}
56+
57+
}
58+
Circle point = new Circle(list.get(0), list.get(1), 10);
59+
PathTransition path = new PathTransition(Duration.millis(4000), polyline1, point);
60+
path.setCycleCount(PathTransition.INDEFINITE);
61+
pane.getChildren().addAll(xAxis, yAxis, polyline1, point);
62+
pane.setOnMouseClicked(e -> {
63+
if (e.getButton() == MouseButton.PRIMARY) {
64+
path.play();
65+
} else if (e.getButton() == MouseButton.SECONDARY) {
66+
path.pause();
67+
}
68+
});
69+
primaryStage.setScene(new Scene(pane, sceneWidth, sceneHeight));
70+
primaryStage.setTitle(getClass().getName());
71+
primaryStage.show();
72+
73+
}
74+
75+
private double calculateY(int x, double centerY) {
76+
return centerY - 50 * Math.sin((x / 100.0) * 2 * Math.PI);
77+
}
78+
79+
private boolean isYIntersectingXAxis(double y, double centerY) {
80+
return y - centerY < 0.01 && y - centerY > -0.01;
81+
}
82+
83+
private void drawXAxis(Pane pane, Polyline xAxis) {
84+
ObservableList<Double> xAxisList = xAxis.getPoints();
85+
double limit = sceneWidth * 0.95;
86+
87+
for (double x = 0; x < limit; x++) {
88+
xAxisList.add(x);
89+
xAxisList.add(centerY);
90+
}
1591

92+
Line line1 = new Line(limit, centerY, limit - sceneWidth * 0.05, centerY * 0.875);
93+
Line line2 = new Line(limit, centerY, limit - sceneWidth * 0.05, centerY / 0.875);
94+
Text text = new Text(limit + (sceneWidth * 0.02), centerY, "X");
95+
text.setFont(Font.font(fontSize));
96+
pane.getChildren().addAll(line1, line2, text);
1697
}
98+
99+
private void drawYAxis(Pane pane, Polyline yAxis) {
100+
101+
ObservableList<Double> yAxisList = yAxis.getPoints();
102+
double limit = sceneHeight * 0.95;
103+
104+
for (double y = 0; y < limit; y++) {
105+
yAxisList.add(centerX);
106+
yAxisList.add(y + sceneHeight * 0.1);
107+
108+
}
109+
Line line1 = new Line(centerX, sceneHeight * 0.1, centerX - sceneWidth * 0.03, sceneHeight * 0.22);
110+
Line line2 = new Line(centerX, sceneHeight * 0.1, centerX + sceneWidth * 0.03, sceneHeight * 0.22);
111+
Text text = new Text(limit + (sceneWidth * 0.2), sceneHeight * 0.1, "Y");
112+
text.setFont(Font.font(fontSize));
113+
pane.getChildren().addAll(line1, line2, text);
114+
}
115+
116+
private String getXAxisLabel(double x) {
117+
if (isRoughlyEqual(x, 0)) {
118+
return "0";
119+
} else if (isRoughlyEqual(x, 50)) {
120+
return "π";
121+
} else if (isRoughlyEqual(x, -50)) {
122+
return "-π";
123+
} else if (isRoughlyEqual(x, 100)) {
124+
return "2π";
125+
} else if (isRoughlyEqual(x, -100)) {
126+
return "-2π";
127+
}
128+
129+
return "";
130+
131+
}
132+
133+
private boolean isRoughlyEqual(double a, double b) {
134+
return a - b < 0.01 && a - b > -0.01;
135+
}
136+
17137
}
138+

0 commit comments

Comments
(0)

AltStyle によって変換されたページ (->オリジナル) /